1) The photoelectric effect is ________.
A) the total reflection of light by metals giving them their typical luster
B) the production of current by silicon solar cells when exposed to sunlight
C) the ejection of electrons by a metal when struck with light of sufficient energy
D) the darkening of photographic film when exposed to an electric field
E) a relativistic effect
2) In which orbital does an electron in a nitrogen atom experience the greatest
shielding?
A) 3p
B) 3s
C) 2p
D) 2s
E) 1s
3) Which of the following molecules has hydrogen bonding as its only intermolecular
force?
A) HF
B) H2O
C) C6H13NH2
D) C5H11OH
E) None, all of the above exhibit dispersion forces.
4) A racemic mixture is ________.
A) an equal mixture of both enantiomers of an optically active species
B) a mixture of an optically active species with an optically inactive species
C) an equal mixture of cis- and trans-isomers
D) a mixture of metal ions and ligands in equilibrium
E) a mixture of structural isomers
5) Which group in the periodic table contains only nonmetals?
A) 1A
B) 6A
C) 2B
D) 2A
E) 8A
6) What is the oxidation number of Ni in [Ni(CN)4]2-?
A) +2
B) +1
C) 0
D) +3
E) +4
7) On average, ________ neutrons are produced by every fission of a uranium-235
nucleus.
A) 4
B) 3.5
C) 1
D) 2.4
E) 2
8) Hydrogen can combine with ________ to form a metallic hydride.
A) an element from group 5A
B) an element from group 7A
C) an element from group 8A
D) an element from group 1A
E) an element from group 6A
9) What forces hold the strands of DNA together?
A) covalent bonds
B) hydrogen bonding
C) ion-dipole attraction
D) coordinate covalent bonds
10) The Ka for HCN is 4.9 x 10-10. What is the value of Kb for CN–?
A) 2.0 x 10-5
B) 4.0 x 10-6
C) 4.9 x 104
D) 4.9 x 10-24
E) 2.0 x 109
11) The ________ ion has a noble gas electron configuration.
A) Cl–
B) F2-
C) F
D) S2+
E) O–
12) The temperature of a 35.1 g sample of iron increases from 24.5 °C to 31.8 °C. If the
specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed?
A) 115 J
B) 0.0936 J
C) -115 J
D) 0.722 J
E) 3.29 J
13) Oxidation cannot occur without ________.
A) acid
B) oxygen
C) water
D) air
E) reduction
14) Which one of the following graphs shows the correct relationship between
concentration and time for a reaction that is second order in [A]?
A)
B)
C)
D)
E)